Can't hold her down! Christina Aguilera is back with new music — but fans are more focused on her seemingly new face. The 38-year-old is rocking fuller lips in her music video for "Acceleration," prompting many to believe she is dabbling with a little plastic surgery here and there. "Omg Christina Aguilera f--ked her face up with these injections," one troll commented on Twitter before another added, "Christina Aguilera bought a new face." She did have some fans in her corner, with one ride-or-die responding, "I actually thought she looked better lol I’m just here for her music." Despite the did-she-or-didn't-she debate, Christina has denied going under the knife. Instead, she revealed in a recent interview that she just loves to experiment with her look. Christina in 2008 vs. 2018. (Photo Credit: Getty Images) "I'm a performer, that's who I am by nature. But I'm at the place, even musically, where it's...